Hi paddyb,
As you can see in the quality/durability guidelines here … the blended Dunlop latex is a good quality and durable material but the 50 kg/m3 memory foam is the equivalent of 3.1 lbs/ft3 which is a lower quality/density and less durable material than I would be completely comfortable with in terms of longer term durability and could be a weak link in the mattress unless the layer is relatively thin (no more than “about an inch or so”). I would also want to know the thickness of each layer and the density of the polyfoam support core as well.
Compressing a foam mattress for a few weeks during transportation won’t harm most good quality foams but with lower quality foams or with longer term compression (such as foams or mattresses that are shipped from China or stored compressed for longer periods of time in a warehouse) it certainly can. Compressing a mattress so that it can be shipped through courier can also result in savings in the delivery costs but some foams that are firmer or denser or stiffer aren’t as suitable for compression and in this case they need to be shipped uncompressed with a common carrier rather than through a courier. A mattress manufacturer will generally work with their foam manufacturer or supplier to make sure that they are using foams that are suitable for the shipping and compression methods they use.
As you can see in the simplified choice mattress topic … they use 2" of 3 lb memory foam which is also a lower quality/density material than I would be comfortable with as well.
Phoenix